Splash into freezing waters on a homemade sled with some of your closest and craziest friends. The Aspen-Snowmass annual Schneetag (the German word for "snow day") calls for dressed-up teams of four to do a skit and then fly down the slope into a frigid pond. Special prizes up for grabs include tickets to the Summer X Games in Los Angeles or to a Colorado Rockies ballgame. Sun 11 a.m.